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In An Instance of the Fingerpost, a historical mystery by Iain Pears, a book cipher conceals one character's family history and its relationship with the English Civil War. In John Le Carre's A Perfect Spy, the protagonist Magnus Pym uses a book cipher based on the German text Simplicissimus.
The ciphertext message contains all the information of the plaintext message, but is not in a format readable by a human or computer without the proper mechanism to decrypt it. The operation of a cipher usually depends on a piece of auxiliary information, called a key (or, in traditional NSA parlance, a cryptovariable). The encrypting procedure ...
symmetric key - a key that is used both to encrypt and decrypt a message. Symmetric keys are typically used with a cipher and must be kept secret to maintain confidentiality. traffic encryption key (TEK)/data encryption key (DEK) - a symmetric key that is used to encrypt messages. TEKs are typically changed frequently, in some systems daily and ...
To decrypt the ciphertext, the recipient requires a secret knowledge from the sender, usually a string of letters, numbers, or bits, called a cryptographic key. The concept is that even if an unauthorized person gets access to the ciphertext during transmission, without the secret key they cannot convert it back to plaintext.
In philology and linguistics, decipherment is the discovery of the meaning of the symbols found in extinct languages and/or alphabets. [1] Decipherment is possible with respect to languages and scripts.
William John Bankes, an English antiquities collector, shipped the obelisk from Egypt to England and copied its inscriptions. These inscriptions were not a single bilingual text like that of the Rosetta Stone, as Bankes assumed, but both inscriptions contained the names "Ptolemy" and " Cleopatra ", the hieroglyphic versions being enclosed by ...
It is possible to decrypt the message without possessing the key but, for a well-designed encryption scheme, considerable computational resources and skills are required. An authorized recipient can easily decrypt the message with the key provided by the originator to recipients but not to unauthorized users.
In the United Kingdom, the Regulation of Investigatory Powers Act gives UK police the powers to force suspects to decrypt files or hand over passwords that protect encryption keys. Failure to comply is an offense in its own right, punishable on conviction by a two-year jail sentence or up to five years in cases involving national security. [ 8 ]